Abstract:To study the quality characteristics and differences of Fuliang green tea of different grades，the sensory quality and physicochemical indicators of Fuliang green tea were measured，and the quality of different grades was evaluated using taste activity value （TAV），correlation analysis，and principal component analysis.The results showed that Fuliang green tea generally exhibited needle-shaped leaves，abundant pointed tips，straight and even shape，emerald green color，and uniform cleanliness. The infusion was bright yellow-green；the taste was fresh and mellow with a sweet aftertaste，and the fragrance was floral or fresh. The leaf base appeared tender and uniformly yellow. The contents of characteristic taste components，such as free amino acids（3.83%-4.20%） and water-soluble extracts （45.16%-48.13%），were relatively high，while the contents of caffeine （3.43%-4.60%），epicatechin （0.33%-0.73%），epicatechin gallate （2.08%-3.07%），epigallocatechin gallate （7.06%-9.74%），and tea polyphenols （17.90%-24.17%） were relatively low. The TAV results indicated that the TAVs of five characteristic components—catechin [（±）-catechin，C]，epicatechin [（-）-epicatechin，EC]，epigallocatechin [（-）-epigallocatechin，EGC]，epicatechin gallate [（-）-epicatechin gallate，ECG]，and epigallocatechin gallate [（-）-epigallocatechin gallate，EGCG]-were greater than 1. Among them，C，EGC，EC，ECG，and EGCG contributed to astringency，and C，EGC，ECG，and EGCG contributed to bitterness. Correlation analysis revealed that the chemical composition of Fuliang green tea，including certain catechin and amino acid components，exhibited a high correlation with sensory quality scores. The sensory evaluation scores were significantly correlated with EC （P＜0.05），ECG （P＜0.001），EGC （P＜0.01），and EGCG （P＜0.05），showing a significant negative correlation with EGC and significant positive correlations with ECG，EC，and EGCG.Principal component analysis revealed that the comprehensive quality scores of Fuliang green tea ranked in descending order as follows：premium grade，first grade，second grade，third grade，and fourth grade. The principal component analysis results of Fuliang green tea were consistent with its production standards and packaging labeling grades.